A Calculation Method of Safety Factor of Foundation Pit Excavation Slope

Abstract

The invention belongs to the field of slope safety evaluation, and in particular relates to a method for calculating the safety coefficient of a foundation pit excavation slope, comprising the following steps: firstly, vertically dividing the sliding soil body of the foundation pit excavation slope; secondly, according to the force The balance condition determines the sliding force of each block and the normal pressure at the bottom of the block, and calculates the anti-sliding force according to the normal pressure value using the Moore-Coulomb strength formula, and determines the local area of ​​the block by using the ratio of the sliding force to the anti-sliding force. Instability coefficient; Then, from the blocks with local instability coefficient greater than 1, select the block with the largest local instability coefficient, and transfer its weight to the next block in the sliding direction, and iterate until the remaining blocks The local instability coefficients of the local instability coefficients are all less than 1. Finally, the ratio of the anti-sliding force and the sliding force of these blocks is combined, which is the safety factor of the sliding soil considering the progressive failure process. The safety factor calculated by this method is reasonable, accurate and intuitive, and greatly The accuracy of slope safety evaluation is improved.

Description

technical field [0001] The invention belongs to the field of slope safety evaluation, in particular to a method for calculating the safety coefficient of a foundation pit excavation slope. Background technique [0002] Landslides are one of the most common geological disasters in my country. Affected by factors such as manual excavation, rainfall, and earthquakes, once a landslide occurs, the sliding rock and soil will cause damage to the personnel in the foundation pit or the industrial and agricultural production facilities downstream of the slope. impact, resulting in varying degrees of damage. Recently, relatively large-scale landslides occurred in my country, including the landslide of residual mud and muck in Guangming New District, Shenzhen, and the collapse of a large-scale foundation pit excavation on Jiushui East Road, Qingdao. These accidents have caused varying degrees of impact on my country's economic development. Therefore, how to conduct slope safety evaluati...

AI Technical Summary

Problems solved by technology

The safety factor obtained by conventional methods alone cannot reasonably evaluate the progressive failure process of excavated slopes. Therefore, there is an urgent need for a method for calculating the safety factor of excavated slopes that can reasonably and effectively consider the analysis of progressive failure processes.

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